如何在 Rust 的 main.rs 中导入 function

Question

This may be a stupid question, but I cannot seem to solve this.

I have this kind of file structure:

└── src
    ├── another.rs
    ├── some_file.rs
    └── main.rs

In the some_file.rs , I want to call a function in the main.rs . So, I tried to do something like this in the some_file.rs :

use crate::main


fn some_func() {
   // other code
   
   main::another_func_in_main();
}

But the compiler throws an error:

use of an undeclared crate or module `main`

How can I solve this?

Answer 1

There is no main module, even though you have a main.rs file. The stuff you put in the main.rs file are considered to be at the root of the crate.

So you have two ways to call the function:

1. Directly (w/o use)

crate::another_func_in_main();

2. By importing it first

use crate::another_func_in_main();

// Then in code, no need for a prefix:
another_func_in_main();